Colloidal dynamics: Influence of diffusion, inertia and colloidal forces on cluster formation

Nina Kovalchuk, Victor Starov, Paul Langston, Nidal Hilal, Viacheslav Zhdanov

Research output: Contribution to journalArticlepeer-review

Abstract

Computer simulations of colloidal suspensions are discussed. The simulations are based on the Langevin equations, pairwise interaction between colloidal particles and take into account Brownian, hydrodynamic and colloidal forces. Comparison of two models, one taking into account inertial term in Langevin equation and another based on diffusional approximation proposed in [D.L. Ermak, J.A. McCammon, J. Chem. Phys. 69 (1978) 1352], has shown that both models enable the prediction of the correct values of the diffusion coefficient and residence time of particle in a doublet and are therefore suitable to study the dynamics of formation and breakage of clusters in colloidal suspensions. It is shown that the appropriate selection of the time step and taking into account inertia of particles provides also the correct value of the average kinetic energy of each particle during the simulations, what allows to use the model based on full Langevin equations as a reference model to verify the validity of the numerical scheme for simulation using diffusion approximation.

Original languageEnglish (US)
Pages (from-to)377-385
Number of pages9
JournalJournal of Colloid And Interface Science
Volume325
Issue number2
DOIs
StatePublished - Sep 15 2008

Keywords

  • Brownian forces
  • Clusters
  • Colloidal forces
  • Colloidal suspensions
  • Fluctuation-dissipation theorem
  • Hydrodynamic interactions
  • Langevin equations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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